Support python wrapper for Windows

[lesleyrs]

Hi, after adding jdtls bin to PATH variable on windows you can't run the lsp server because they are python scripts. I know you can use the java command but then you would need to use a different command for Linux and Windows and it requires you to set the options manually.

Adding a simple batch file to the bin directory allows it to be run from path on Windows with just "jdtls". I think putting it in scripts directory would copy it there? Didn't build it myself.

This change is important for editors, particularly for https://github.com/helix-editor/helix/blob/master/languages.toml#L36 to be able to work out of the box.

Discussion about this here helix-editor/helix#5861.

[eclipse-ls-bot]

Can one of the admins verify this patch?

[lesleyrs]

Maybe change it to python %~dp0/jdtls %1 %2 to be able to pass options? I'm not familiar with jdtls so not sure if that's useful with the scripts.

[rgrunber]

Yes, putting it in the scripts directory would copy it to the final destination.

Maybe change it to python %~dp0/jdtls %1 %2 to be able to pass options? I'm not familiar with jdtls so not sure if that's useful with the scripts.

It would probably need to be %* to pass all other arguments.

[lesleyrs]

Ok done, I don't have an eclipse account though. If there's a problem with that, somebody can just close this PR and create a new one.

[datho7561]

I can take a look at this some time today, just setting up Helix on my Windows box...

[datho7561]

Looks good to me. I added eclipse.jdt.ls\org.eclipse.jdt.ls.product\target\repository\bin to PATH, and I can get validation and go-to-definition in Helix.

[rgrunber]

Going by https://www.eclipse.org/projects/handbook/#contributing-eca maybe we can avoid re-creating this PR by just confirming what signing the ECA implies.

@lesleyrs :

1. Is this contribution written by you ?
2. Do you have the necessary permission to make this contribution ?
3. Do you agree to make this contribution under the EPL-2.0 license that JDT-LS uses ?

[lesleyrs]

Going by https://www.eclipse.org/projects/handbook/#contributing-eca maybe we can avoid re-creating this PR by just confirming what signing the ECA implies.

@lesleyrs :

1. Is this contribution written by you ?

Yes it has been written by me.

2. Do you have the necessary permission to make this contribution ?

Yes

3. Do you agree to make this contribution under the EPL-2.0 license that JDT-LS uses ?

Sure no problem.